使用Desc/Asc排序的Order By子句聲明

Question

SELECT * 
FROM 
    TableName 
WHERE 
ORDER BY 
    CASE @OrderByColumn 
    WHEN 1 THEN Forename 
    WHEN 2 THEN Surname 
    END; 

我有一個類似上面的聲明，它讓我動態選擇如何排序查詢結果。但是，如何指定我要訂購的姓氏DESC和姓氏ASC？

Answer 1

你需要分割你的兩個ORDER BY部分：

SELECT * 
FROM 
    TableName 
WHERE 
ORDER BY 
    (CASE @OrderByColumn 
    WHEN 1 THEN Forename 
    END) DESC -- Forename --> descending 
, (CASE @OrderByColumn 
    WHEN 2 THEN Surname 
    END) ASC -- Surname --> ascending 

Answer 2

您需要在order by兩個子句：

ORDER BY (CASE WHEN @OrderByColumn = 1 and @Dir = 'ASC' THEN Forename 
       WHEN @OrderByColumn = 2 and @Dir = 'ASC' THEN Surname 
      END) ASC, 
     (CASE WHEN @OrderByColumn = 1 and @Dir = 'DESC' THEN Forename 
       WHEN @OrderByColumn = 2 and @Dir = 'DESC' THEN Surname 
      END) DESC 

Answer 3

另一個例子：

SELECT * FROM dbo.Employee 
ORDER BY 
CASE WHEN Gender='Male' THEN EmployeeName END Desc, 
CASE WHEN Gender='Female' THEN Country END ASC 

更多細節.. 。http://codechef4u.com/post/2015/04/07/order-by-clause-with-case-expressions-case-statement